Temperature indicator



Sept. 17, 1929. RIDER 1,728,907

TEMPERATURE INDICATOR I Filed April 2:5, 192'? I v ATTOR Y Patented Sept. 17, 1929 .2?

UNITED STATES HERBERT E. RIDER, OF NEW YORK, N. Y.,

YORK,

ASSIGNOR TO EDWARD L. I -TALL, OF NEW N. Y. e

TEMPERATURE innionroia Application filed April 23,

My invention relates to thermostatically operated heat indicators, and the object of my invention is to provide a heat indicator suitable for use in the oven of a domestic gas range or cook stove.

A further object is to provide a device for the purpose, that may be made as an independent article of manufacture and which can be attached to an oven door and detached therefrom instantly without the use of tools.

A further object is to provide an indicator of this type that can be made at a very low cost and at the same time is sensitive to changes in temperature in the oven.

Referring to the drawings which form a part of this specification:

Figure 1 is a vertical sectional viewthru an indicator embodying my invention, shown mounted on an oven door.

Figure 2 is a front view of the indicator.

Figure 3. is a back view, showing the spring clamp heat conductor partly broken away to show the back of the casing for the mechanism.

Figure 4 is a plan view of the device.

Figure 5 is a perspective view of the indicator hand. i I A and A indicate the oven and oven door respectively. B indicates a heat conducting clamp, one side of which also serves as a back for the casing C. The device is made about the size as shown in the drawings. The clamp comprises the portion B which rests within the oven, the top B and the portion 13*, all made integral from a sheet of heat conducting material such as copper or aluminum which has a high heat conducting capacity relative to iron.

The clamp is separated from contact with the oven wall except at its bottom end B, and at the contact points B and with the oven door by the edge 13*, and the points B", which are provided by crimping the metal as illustrated, the purpose of which is to prevent conduction of heat from the clamp to the outer wall of the oven or door, thus permitting the heat to be conducted directly at oven temperature to the thermostat D which is mounted at D on the conductor clamp portion B near the upper end thereof so that the 1927. Serial No. 185,964,

heat will travel but a short distance to operate the thermostat and the conductor will not drop much in temperature due to radiation of the heat from the surfaces exposed to the outer atmosphere.

The casing C, is secured to the portion B by clips EE etc. made integral with the casing C, and which extend thru slits E -E etc. formed in the said portion.

The upper end of the thermostat is held to the wall 13 by a clip E formed from a portion of the wall which is slitted on three sides and bent outward into the space F, and is formed with smaller clips GG which are bent around the end of the thermostat as illustrated. The casing C, is cut away to provide an opening C to expose to view a dial plate H which is graduated or otherwise imprinted to indicate the temperature readings.

The dial plate is made of any suitable material such as a thin sheet metal or card board, and is secured to the casing C by a pivot I.

A pin J, is secured to the casing C and extends thru and supports an indicator hand J which swings on said pin J as the free end of the thermostat D, which extends thru the slot J moves as the temperature in the oven fluctuates. The pointer J 3 swings overv the dial as illustrated. I prefer to cover the dial with a sheet of transparent material K, which is clamped by the pin J to the inner front wall of the casing substantially as shown.

The clamp is made wide to insure heat carrying capacity and to afi'ord a strong spring pressure to hold it firmly to the oven door.

The crimped formation of the contacts B and B serve to stiffen this spring action.

The construction as a whole is simple and durable and may be made at a very low cost.

Having thus described my invention I claim as new:

1. A temperature indicator of the character described comprising a casing the back wall having an extension bent to form a hook to support the casing, said hook having em bossed portions at the bight of the hook to 100 present contact regions of relatively small areas for the purposes set forth.

2. A temperature indicator of the character described adapted to be mounted on a support, comprising a casing having a temperature responsive element mounted therein on one Wall thereof, said Wall comprising a heat conductor in direct contact With one end of said element to conduct heat thereto and having a hook-shaped portion the bight of Which is crimped to provide regions of relatively small areas of contact with the support.

In testimony whereof I have afiixed my signature.

HERBERT E. RIDER. 

